> it's not scientific to guess a number because you proved guessing isn't a risk because it's such a non-factor. In general you just remove the non-factor.
But then you don't have a reasonable lower bound, and someone trying to debunk the analysis could, instead of throwing un-falsifiable claims of un-scientificness, make the much stronger accusation that the combined white+Jewish mean SAT score is being unfairly attributed to non-Jewish whites alone.
> They're using scores from across the 100% of college applicants when less than 1% of them apply to Ivy League schools.
Seems relevant to me - it would be very surprising if the mean of the SAT score distribution didn't strongly affect its top percentile. If you're not satisfied with reasonable extrapolation, you can find what the SAT scores are for the top percentile of white/Hispanic/Black students. I wager that sorting the SAT scores by mean or by top percentile gives the same order. But as you say, I failed high school stats, so I'm probably wrong.